3.6 Angles in Polygons GCSE PowerPoint Lesson

This 28-slide lesson focuses on calculating angles in both regular and irregular polygons. Students will learn how to find the sum of interior angles using the formula (n − 2) × 180 and apply it to determine individual interior angles in both regular and irregular polygons. The lesson also introduces exterior angles, showing how they relate to interior angles and always sum to 360°. Through a mix of examples and reasoning tasks, students will develop a clear understanding of how angle properties apply to polygons of different types and sizes.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• Two structured tasks to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential geometry concepts.